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The .378 Weatherby; The Magnum's Magnum

I've wanted to write an article on the mighty .378 Weatherby for some time, but felt I lacked the experience with the cartridge to do it true justice. One of our members, Wbypoor (Glenn), has added his wealth of experience with the .378 to this article supported by 30 years of use, which is more than anyone I know of and, as co-author, certainly adds considerable depth and breadth to this important cartridge in the Weatherby line-up.

For those who must have the most of everything, there is the .378 Weatherby Magnum; truly a magnum’s magnum. Isn’t it interesting that when discussing the merits of the 378 the first thing to tackle is the recoil rumor? It leaves precious little space to discuss the history of the cartridge, how and when Roy developed it, and the fact that Federal developed a special primer just for the project.
Yes, the .378 Weatherby will generate considerable free recoil, an average of 77 ft. lbs. from a 9 lb rifle. This compares to 20 ft.lbs from a rifle chambered for .30-06 Springfield, but is only 10% more than the recoil of the .375 H&H Magnum while having 22% more energy. There are some shooters who can handle recoil extremely well. Not because they don’t feel it, but because they know the recoil is coming and they can go right ahead and squeeze off a good shot. When some joker tells you he never feels recoil, he is either too dumb to be walking around, or he is a damn liar. There are an awful lot of hunters who are scared stiff of recoil and just plain can’t help it, some admit it and some don’t, but you’d just as well face up to it and either learn to whip it or shoot something you’re not afraid of. The .378 has less recoil than almost all cartridges of its energy class. While the recoil is stiff, exaggerations have likely done a lot to reduce the popularity of this caliber. Case in point: The Hodgdon Data Manual No. 26 describes it as, " . . . far too vicious for all but the most seasoned shooters." The Barnes Reloading Manual No. 1 reads, "This cartridge will develop literally tons of energy, but it is also known as perhaps the hardest kicking round there is." In fact, most of what you hear about the recoil of the .378 is purely exaggeration and usually comes from those passing along Old Wives tales. Here’s how I look at it: Currently there are 5 Weatherby cartridges based on the same case: the .30-.378, .338-.378, .378, .416, and the mighty .460. Some say that the recoil of the .378 may make it the hardest recoiling rifle on the planet because of its recoil velocity. Others say that it’s the hardest kicking of all Weatherby’s cartridge creations. Thought through logically, none of this makes any sense at all. Why would it? There is no magical property about the middle child in the big case line-up that makes it recoil harder than factory loads on the same case that are smaller, and also recoil more than factory cartridges on the same case that are larger. Recoil progresses as Newton predicted as you move up through the line-up from the .30-.378 to the .460. Period. Here’s what Glenn has to say about this: “Whenever a fellow shooter hears I’m shooting a 378 they invariable begin shaking in their boots! I don’t know who started the misguided rumor that by some voodoo the 378 is an unmanageable beast but I remember reading about it as a young boy. My first Mark V was a 460 and when luck finally brought cash and a good used 378 together I had a great opportunity to tangle with this beast. Imagine my great surprise when I found it was just like any other cartridge and behaved accordingly. Interestingly those who have not read of the 378’s reputation as a kicker find it easily managed. Even my 71 year old father finds my unbraked DGR easy to shoot ,but balks at a M77 in 416 Rigby and a 416 Ruger No. 1. Personally I find that those so straight combed rifles (classic? I think the Mark V is a classic!) generate more felt recoil than they should. I had a custom No.1 in 378 some years ago that punched the shoulder much harder than a Mark V, at least for me”.
Moving past that, I have always been enamored by the .378 Weatherby. I also hold the same fascination with the .340 Weatherby. Something in their names just do it for me, I guess. An argument can be made that they are the two most versatile worldwide cartridges in the entire Weatherby family. I would be one to support that. In the same way that the .340 is the .338 Win. Mag. on steroids, the .378 is the .375 H&H on steroids. As one can argue that the .338 and .375 are extremely versatile cartridges for anything worldwide, the Weatherby variations make it even more so. The same can be said about any standard cartridges when compared to its Weatherby counterpart. Although the .340 and .378 are versatility kings, there are noteworthy differences. Glenn supports this by saying, “The 378 reaches similar velocities with larger diameter bullets; giving the 378 the unique ability to simplify shots to 400 yards when needed yet qualify as a dangerous game rifle in the African jurisdictions that restrict hunting dangerous game to rifle above .375 caliber. Of course the newer Remington 375 Ultra Mag can fill this role as well, 50 years late. Though very versatile, unfortunately the .338 caliber cartridges cannot meet the DG restrictions thus could never be considered a sound choice as a single rifle for a world wide hunter….Very few cartridges can match the 378’s effectiveness at a quarter mile”. While it shares the same bullet diameter as the .375 H&H, the velocity is in a different realm; the .378 pushes a 300 grain bullet at close to 3000 fps. That is an amazing statistic by anyone’s standards.
And so it is with the .378 Weatherby. While the .378’s prowess against dangerous game has been highly touted, it’s greatest potential has almost been overlooked. With a trajectory comparable to a .340, and double the horsepower of a .30-06 at any distance, the .378 becomes an extraordinary long-range cartridge for any rifleman pursuing elk, moose, big bears, and larger African game. The .378 Weatherby is a monumental cartridge in its size, power, and capabilities. While the statistics of the .378 are heroic, Glenn reminds us, “As we’ve read, there are many stories floating around the big game hunting circles of the 378’s bullet failures on heavy game. With any cartridge bullet selection is always critical, even more so for dangerous game and high velocity cartridges. All of the troubles associated with the 378 can be directly traced to the root cause of using improper bullets for the quarry. Since the introduction of the Barnes X bullet and its later evolutions, the 378 has come into a world of its own. The effect of a high velocity 375 caliber bullet on flesh and bone is devastating and gone are the worries of bullets self-destructing. Shoot these 375 Barnes mono-metal bullets as fast as you wish, they will not fail. Neither will the 378”.
There are many who consider this their favorite Weatherby cartridge. My favorite is still the .340, but I’d welcome the chance to see if the .378 can replace it. Well, not really, but I think it can be a valuable addition. A .270, .340, and .378 Weatherby would make for a very well rounded trio. Top it off with a varmint caliber and a charge stopper, and you’d have it all.
I like this quote best from Weatherby himself when it comes to the .378 Weatherby Magnum:

"Because there was a definite need for a large bore, heavy bullet traveling at high velocity, we developed the .378 Magnum. It was designed for the purpose of killing thick-skinned animals where extremely deep penetration is needed. This is truly the rifle for the man who wants the utmost in killing power when concentrating on the world's largest and most dangerous game."

Another quote from Glenn is a fitting way to end this article about the Magnum’s magnum:

“….I can’t help but get excited about a cartridge and rifle I’ve been using for 30 years now. In fact as time has passed I have learned to enjoy the 378’s notoriety as the big bad boy on the block, it always makes me chuckle when I seem them shaking like the world might stop spinning when I pull a 378 out of the case….”

Very enjoyable article. I too, love my 378, whether its braked or un-braked, it always gets lots of attention. With the brake on, the recoil is extremely manageable and my Fiancé likes to shoot it. As our range is covered, when she pulls the trigger, dust flies off the roof structure and it makes LOTS of noise. Its never long before someone is over asking her what she's shooting. Strangely, no one really ever accepts her invitations to shoot it. Its just lotsa fun!

Thank You for the article, I found it very enjoyable to read. When I was a young boy I would go into my bedroom and read the ballistic of all the caliber listed in my reloading manuals. I was overwelmed when I read about the .378 Weatherby Magnum. Twenty two years later I now owen two of the hot dog size cartridge. I've hunted from Praire dogs up to Bull Moose and everything in between. AWESOME CALIBER.

Well after reading this I want another go round with the 378. I think its funny that people are more scared to shoot a 378 than a 460. The 378 kicked fast and hard but the 460 was harder for sure. My MKV in 375 H&H might need a rechamber. Those skinny little shells seem so inadaquate.

I just love my .378 without brake. sometimes i think that it don't like me , my when it kicks me :-)

Thank you! And a big thanks to Wbypoor for his insight and experience with this cartridge over the course of 30 years

Originally Posted by Scratch

Thank You for the article, I found it very enjoyable to read. When I was a young boy I would go into my bedroom and read the ballistic of all the caliber listed in my reloading manuals. I was overwelmed when I read about the .378 Weatherby Magnum. Twenty two years later I now owen two of the hot dog size cartridge. I've hunted from Praire dogs up to Bull Moose and everything in between. AWESOME CALIBER.

Well said ,who ever came up with the saying a Magnums MAGNUM.

THanks

Scratch

I believe Mike378 is correct; Bob Hagel is the name that comes to mind regarding the phrase, "Magnum's magnum".

I'm really surprised at the attention this article on the .378 is getting considering it's probably the rifle owned by the fewest number of Forum members! Either there's a stronger facination for the bigger Weatherby's than what I thought or, members were really victim to the nasty fables around the .378 and are pleased to see a different side to the story. I wonder if the .416 and .460 would receive similar responses? I have yet to pull the trigger on a .378, but have really enjoyed shooting the .416 and .460.

Oh yes! You are welcome, we got wild boars on our huntingarea now. Or if we get together in the autumn we got more animals to hunt. If some ells of our frends from over there is in the neighbourhood they can enyoj us.